| 1 | // (C) Copyright Jeremy Siek 1999. |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 3 | // accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #ifndef BOOST_TREE_STRUCTURE_HPP |
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| 7 | #define BOOST_TREE_STRUCTURE_HPP |
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| 8 | |
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| 9 | namespace boost { |
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| 10 | |
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| 11 | template <class T> |
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| 12 | struct tree_traits { |
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| 13 | typedef typename T::node_descriptor node_descriptor; |
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| 14 | typedef typename T::children_iterator children_iterator; |
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| 15 | }; |
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| 16 | |
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| 17 | |
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| 18 | template <class Tree, class TreeVisitor> |
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| 19 | void traverse_tree(typename tree_traits<Tree>::node_descriptor v, |
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| 20 | Tree& t, TreeVisitor visitor) |
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| 21 | { |
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| 22 | visitor.preorder(v, t); |
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| 23 | typename tree_traits<Tree>::children_iterator i, end; |
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| 24 | tie(i, end) = children(v, t); |
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| 25 | if (i != end) { |
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| 26 | traverse_tree(*i++, t, visitor); |
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| 27 | visitor.inorder(v, t); |
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| 28 | while (i != end) |
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| 29 | traverse_tree(*i++, t, visitor); |
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| 30 | } else |
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| 31 | visitor.inorder(v, t); |
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| 32 | visitor.postorder(v, t); |
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| 33 | } |
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| 34 | |
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| 35 | struct null_tree_visitor { |
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| 36 | template <typename Node, typename Tree> void preorder(Node, Tree&) { } |
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| 37 | template <typename Node, typename Tree> void inorder(Node, Tree&) { } |
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| 38 | template <typename Node, typename Tree> void postorder(Node, Tree&) { } |
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| 39 | }; |
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| 40 | |
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| 41 | } /* namespace boost */ |
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| 42 | |
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| 43 | #endif /* BOOST_TREE_STRUCTURE_HPP */ |
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